add M5StamPLC Library (#6082)

* add M5Module-LLM lib

* add M5Atomic-EchoBase lib

* add M5StamPLC Library

Author: Gitshaoxiang

repositories.txt

@@ -4030,6 +4030,7 @@ https://github.com/m5stack/TimerCam-arduino
 https://github.com/m5stack/M5-SX127x
 https://github.com/m5stack/M5Unit-8Encoder
 https://github.com/m5stack/M5Module-LLM
+https://github.com/m5stack/M5StamPLC
 https://github.com/machinefi/psa-crypto-arduino
 https://github.com/machinefi/w3bstream-client-arduino-ce
 https://github.com/MacroYau/LTC2942-Arduino-Library